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    <title>实验1朱志文</title>
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        document.write("<h2>网页由三个部分组成</h2><h4>\n" +
            "        <ul>\n" +
            "            <li>结构</li>\n" +
            "            <li>表现</li>\n" +
            "            <li>行为</li>\n" +
            "        </ul>\n" +
            "    </h4>")
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